Mercruiser overheating at idle. Temp is normal if at 1000 or above.
- Mercruiser overheating at idle. If I idle for more then 2-3 minutes the overheat warning horns sounds off. An overheating outboard isn’t just a nuisance; it’s a cry for help from your boat’s heart — the engine. 3 MerCruiser engine? To prevent overheating, ensure that your 4. In some cases, the engine may crank slowly but still fails to start over. Engine RPM does not seem to matter. When it runs hot and the alarm goes off I can tap the gas and the temperature immediately goes down back to normal. I backflushed from there, but the problem is still occurring. 3L overheating at at idle It's your impeller. 0 often stems from a failing impeller or restricted water flow. Additionally, overheating is a common engine problem among jet skis and other types of boats. If the impeller is shot, it would be moving just enough water at an idle to keep it cooled off. If I push the throttle to 1000rpm, the temp drops. 1989 5. Check the raw water strainer for debris restricting flow. is the thermostat hsg. 7 Mercruiser with Alpha 1 outdrive. But when things do go wrong with the cooling system, the Mercruiser is easy to troubleshoot and repair. I have a 1994 stingray 719zp that originally came with the 4. Raw Water cooling system. After replacement I hooked her up with muffs and she I'm having a problem with overheating and the engines going into "safe mode". So, Do not ignore the overheating warning. 0 LX/V8 Alpha One engine. This article is your guide to troubleshooting and resolving those pesky Mercruiser 4. A Tiny piece of wood jammed inside small pick hole! FIXED. I have a 2006 Mercury Optimax. I notice that the water tell is not squirting out a steady stream of water either at idle either. I did We would like to show you a description here but the site won’t allow us. I've We would like to show you a description here but the site won’t allow us. It only happens over time when running pretty well full rpms. New sea water pump, new recirculation Just bought 1994 boat with a 4. and also if you have the older thermostat hsg with check balls in the "T"connecter on Author Topic: [SOLVED!] used Mercruiser 140 engine - overheating? (Read 14741 times) 0 Members and 1 Guest are viewing this topic. 7 Mercruiser sterndrive raw water cooled. 7 vortec long block. I have changed the warning module, water pump, thermostats, water lines, poppet valve, Started getting continuous beep alarm while at idle on my 2010 Opti 150. But when at idle or at low "no I ordered an upgraded stainless steel pump from Hardin Marine, and it's far superior to that brass OEM Mercruiser piece of crap. I would re check the work for impeller key in,gaskets on correct,blockages Re: Mercruiser 4. Water pressure is fine, temp shows We would like to show you a description here but the site won’t allow us. Taking her back in for inspection and repair. I have put a General Q & A - 525 EFI Overheat Problem - Please help! Recently spent 20K with a reputable engine builder to rebuilt a 525 EFI. as these housings had different amounts of water flow being supplied from the drive. or for a alpha one gen II. If I increase the Rpms it cools it down. If the manifolds and risers were plugged up, I wouldn't expect a low pressure problem. Manifolds-raisers - impeller new. I had issues on the water about a month ago overheating at idle speed. However, like all mechanical devices, it may develop problems over time. 9K views 14 replies 8 participants last post by Cast away nick Aug 28, 2018 Re: Mercury BlackMax 150 overheating at idle You replaced it or shop mechanic? I had the same problem with high temps at low speed and idle. If your engine is overheating, chances are the cooling water isn't pumping through the motor. 0 mpi overheats at idle How long has it been in the water? Obviously, you have a new engine from the original 1990 engine, did the exhaust manifolds and risers get replaced with the new engine? I would suggest you get one of those IR Temp guns and verify the engine temp to see if it actually is overheating or not. 170 while cruising seems high to me, but I dont have a heat exchanger, just straight lake water that is 65-70 degrees. 2L Overheating even at idle My engine over heats at idle and was told that one of my water jackets in my block was sealed shut from a previous owner that patched the block. Took it in for inspection and repair last week. This doesn't happen on water muffs only when I had an issue that stumped me for three years (my boating season is limited to a few weeks per year on vacation), and I finally solved it and thought some might be interested. I also noticed that my sea strainer As title says, my 2002 Mercury 60hp two stroke has just started overheating at idle. At low speeds or idle, the engine will cool properly. As I said it does Dual Mercury Master Technician - for Mercury Outboards, Mercruiser and Mercury Racing at European Marine in Greenville, SC. An overheated engine can lead to severe damage, so it is Mercury 150 Overheating I?ve been struggling with an overheating problem for two years now. Let’s explore three frequent issues: overheating, We would like to show you a description here but the site won’t allow us. increasing rpm and pressure makes a sticky thermo unstick and operate like it should, worth a try, they are cheap ( compared to other parts! ) good luck ron Re: 350 Mag MPI Overheat at Idle I would be suspect of the raw water pump housing itself since you are getting a low pressure alarm as well as an overheat. Also, check the raw water intake for blockages like debris or marine growth. If you are under way and see your temp gauge too hot and you pull back to idle at slow speed and the temp stay hot or gets even hotter after idling for a while chances are good you have a bad water pump impellar (provided the water intake is clear of debris). The mercruiser has to run a thermostat and the white plastic diverter that goes under it. First time out we had an overheat alarm on STB engine at idle. Rev engine to 1,000 or more - engine rapidly cools to 145 degrees. 4 with about 850hrs. Low speed relies on impeller and tstats. I knew there were shutters in there, since all inboards with an exhaust close to the water line I had issues on the water about a month ago overheating at idle speed. It's not supplying enough water at idle to cool the engine. The waterpump and thermostats were replaced 6 months ago. Sometimes it will climb to 200 degree after shut down. It is reliable and usually the annual maintenance performed during winter layup will prevent overheating problems. To be more specific: when running cruise and wot the temp is steady 71-73 degrees C (160-165F) but when returning at the dock and idles the temp raises till 85-88C (185-190F) not more. Here is how I diagnose and repair an overheating boat engine without pulling it out of the water. Common Engine Issues Mercruiser 3. 7 overheating at idle I do have a loby cam installed, i dont know the exact specs on it but it does sound nice I checked the hose off the outdrive going to the thermostat housing both before and after the Impeller swap and I ended up with the same water flow/surge results after the replacement impeller kit. When you increase revs and speed the poppet opens and higher volumes are forced through cooling system. 3l w/Alpha One gen one raw water pick Boat is a 1990 Bayliner Ciera 2651 with Mercruiser 5. after checking the engine compartment I noticed water dripping from manifolds--both POPPET VALVE! If you're watching this video, odds are you are experiencing an overheating scenario with your outboard while at low rpm/idle. In that case, you have to pay that person his dues. Everything is new, water circ pump, impeller in stern drive, intake manifold, exhaust manifolds, risers, thermostat housing with 140f thermostat, sensors in We would like to show you a description here but the site won’t allow us. 7 built with new Impeller, circulating pump and thermostat. I turned the ignition off and when I turned it back on the alarm went off. If you increase the speed to 2000 rpm it goes back to 150 degrees. 3 MerCruiser has a clean and properly functioning cooling system. The Raw water pump is pumping plenty, and the heat exchanger is clean. Took delivery of a new 27' Onslow Bay CC, powered by twin 300 hp Mercury Verado V-8's, on 3 May. I have smartcraft gauge which is very useful because i Dual Mercury Master Technician - for Mercury Outboards, Mercruiser and Mercury Racing at European Marine in Greenville, SC. snailman, do you know what year and type of thermostat hsg. 7 L engine that is overheating. There is water flowing from the tell tail, however, the To avoid overheating in MerCruiser 5. There is some cooling happening, but it's clearly not where it should be. I have a 2004 Mercury 50 4 stroke EFI with less the 5 hours on it. - First time out, starts no problem from go. I replaced the water Dual Mercury Master Technician - for Mercury Outboards, Mercruiser and Mercury Racing at European Marine in Greenville, SC. Temp is normal if at 1000 or above. Anything higher than 190 for any length of time has caused me problems I have a 1994 7. 3 engine problems. Some common issues with Mercury 90 hp 4-stroke engines include fuel system problems, fouled spark plugs, overheating, and electrical issues. I replaced the raw water impeller, which was missing about four blades, and I found 1. However if i rev engine above 1100 rpm temp quickly starts to drop to normal . The riser elbow is also clear. 3 mercruiser, 1 st time out it started to overheat at full throttle and also at idle, but at cruising speed 25 mph it was fine. But when at idle or at low "no wake" cruising speeds the boat starts to overheat. Pdf: https://kupdf. Regular maintenance and inspection of your engine will help prevent these 1991 Checkmate persuader got a new 5. Thoughts? Do these frequently go bad? You could swap the sensors to see if the problem follows the sensor or stays with the OB. #CaptainJonSaltLife #Overheating #Outboard Re: 87 Mercruiser overheating at idle (under 1000rpm) First and foremost, disconnect the water supply hose and see how much volume you have coming out. Whether you’re operating a powerful outboard, an inboard ski boat, or a jet ski, understanding the causes of overheating—and how to prevent them—could save your summer and your wallet. 3 alpha 1 Gen II. I changed the impeller and thermostat. Some users have also claimed that sometimes the motor Some common problems with 3. Cools when running. Consider a We would like to show you a description here but the site won’t allow us. The Re: Mercury outboard overheating my money is on the poppet, bet it aint seating right, spring should be preloaded when installed in block, should have bout 5 to 9 pounds of pressure when assembled. Explore the following causes and solutions for an overheating engine: Possible Cause: Insufficient Over the years I've followed closely threads on chasing down overheating issues on this motor (circa 1985 Merc 260). Have the exh. 3 overheats at idle only What type of coolant is this system using? You need 50/50 Ethylene Glycol the green coolant. Boat overheats at higher rims when getting on plane. We’ll delve into the most frequent issues, from starting difficulties to overheating, and provide step-by-step solutions. 3L Mercruiser MPI mercruiser 4. Still consider myself a " Marine Apprentice " after 48 years (learn something new every day). Upon receiving the motor back the water temperature climbs to 165 degrees at idle. Hi guys, I'm helping out a neighbor with an overheat issue on his mercruiser. 7, serial number 6732604 – with Alpha I outdrive. Most of these issues can be avoided or mitigated through regular Re: 2001 135 Optimax overheating at idle bet its the thermostats. So far I have replaced the stern drive water pump/impeller, new 140 degree t-stat, and a new engine water pump and i'm still seeing the engine temps climb while i'm at idle in Re: 5. Inspect the impeller for wear or damage, as it pumps cooling water through the engine. I have re-powered this summer with the 5. However, if the problem is serious, you may need to seek the help of a professional. It is running in the driveway but overheats at an idle. Engine Overheating One of the most common issues with Mercury 4-stroke outboards is engine overheating. MerCruiser 4. Initially, it overheated at idle. Dex-cool has been known to cause issues. 3 mercruiser. Hello, my 2009 350 mag mpi (1A348183) alpha one genii drive, running hot when it is on idle. Guys, I'm beginning to think my temp sensor in port engine is bad. When i swapped the impeller i noticed that it appeared to be in good condition, but the steel housing was pretty rough inside. 3l mpi overheating overheating at idle 1 reading Jump to Latest 8. 3 Mercruiser operating temps? Overheating? Still having some overheating issues and I am completely stumped at this point so if anyone has any advice I would really appreciate it. I replaced the thermostat and cleaned the plastic balls and Symptoms: Engine gradually reaches high temperature while idling, somewhere around 200F (and yes, it's actually overheating, the thermostat housing was HOT!). It will overheat when brought back to idle. At times it will overheat at idle. Engine overheats at dead idle 600 rpm. My sbc with Alpha outdrive overheats at idle. This plastic diverter if broken or not installed correctly will allow most of your water to run out the exhaust and not thru the block. 5 blades in the closed-cooled heat exchanger end caps. At idle, the boat Boat is a 1990 Bayliner Ciera 2651 with Mercruiser 5. 0 engines are reliable, but they can face some common issues. like when I'm Hey there! I've got a 2004 Tahoe Q4 with a mercruiser 4. We would like to show you a description here but the site won’t allow us. I had an issue that stumped me for three years (my boating season is limited to a few weeks per year on vacation), and I finally solved it and thought some might be interested. Overheating Troubleshoot - 4. How long does it take for the engine to start overheating when idling? Customer: less than 10 minutes Mechanic's Assistant: Has the cooling system been serviced or checked recently? Customer: No Mechanic's Assistant: OK. for a alpha one . Environment: Fresh water only – never in Conclusion The Mercury 50 hp 4 stroke engine is a high-quality outboard motor that provides excellent performance. If overheating only occurs at the higher throttle, look at one of the above Engine Highspeed Overheat Troubleshooting If your engine temp is OK at idle and slow speeds but when you get on plane you notice that the temp slowely keeps creeping up and up, you might have clogged and/or rusted exhaust manifold or riser water passages. If I shift into gear and get the rpms up a Do It Yourself, Boating on a Budget - Mercruiser Manifolds and Risers Getting Hot - I just put back together my Formula 252 with 454 Mag motor. Temp is steady at 160 during cruise. should idle with 3 pounds pressure on water pressure gauge, good luck ron Re: mercruiser 5. For marine professionals, understanding the intricacies of an outboard motor’s Greetings, Members! There are several posts regarding this topic, but wanted to do a refresh and ask for everyone’s help – I am at a loss at the moment. It is a 1989 4. My kit had a new housing so did a complete replacement. How can I determine if the manifold risers are the issue? Additionally, there is a fresh water hose flushing adapter on the manifold, and it does not overheat when this is connected Improper operation Overheating from excessive load will show up only at higher throttle settings. Thanks Got an 89 Searay 5. I never let it get over 190 degrees before shutting it down. The alarm only goes off at idle. It should be quite a bit or about equal to 1500 RPM simply without the pressure. Re: Mercruiser 7. Mercury marine 350 mag mpi 2005 and overheats at idle can I get an expert to help with this ? Re: 1975 Mercruiser 165 overheating at idle I've got a 1976 Mercruiser 165, and it runs about 140-150 all the time. Cost of Fixing Mercury Outboard Overheat Alarm In case of primary problems, you can fix your Mercury outboard overheating alarm without any cost through DIY. We still have overheat alarms on Port and STB engines when in reverse. . Whether its in neutral or low rpm idle, after a few minutes the water coming out of telltale gets significantly warmer and the alarm goes off. Usually the engine will slowley cool back down after you come off plane and cruise Re: 4. Has anyone Re: 5. Overheating An overheating Mercury 2-stroke outboard can lead to severe damage if not promptly addressed. I've got a Twin Mercruisr 5l Petrol (Gas) V8 set up, One of which is overheating, risers getting very hot, very quickly. - Critical alarms almost instant while idle OVERHEAT. Never gets hot while running, but always at idle after a long run. Looking for possible solutions or if any has had this issue 2020 Merc 300 Pro XS 4 stroke. How can I prevent overheating in my 4. Replace the impeller if damaged, and clean the intake screens regularly. I have mercury 2002 225 Optimax temp starts rising only at idle normal temp around 130-135 but at idle it quickly starts rising till alarm sounds around 175 180 . 4L Overheat As far as I can remember, don't the 7. Total hours so far are ~5. manifolds and risers cleaned at a radiator shop or replace them--stay If your engine temp is OK at idle and slow speeds but when you get on plane you notice that the temp slowely keeps creeping up and up, you might have clogged and/or rusted exhaust It really acts like a stuck thermostat but after using 3 different ones it still overheats at idle. I The 1983 Alpha 1 leg isn't pushing enough water at idle for the 454's generated heat. Under power engine temp is normal only at idle does it get hot, is this Hi Guys, My mechanics have discovered a significant overheating problem centred around one end cylinder on my 7. is on this engine . Overheating, power loss, starting Customer: Hi I have a Mercruiser 5. Outboard Motor Does Not Start: The first common troubleshooting issue that most users complain about is when the mercury four-stroke motor suddenly fails to start like usual. Once it got hot from running and backed down to an idle, there wouldn't be enough water The Mercruiser stern drive is one of the most popular marine propulsion systems on the water. Took the risers off cleaned all the hoses. This An overheating engine at idle often indicates a thermostat problem. The other day, I dropped my boat in the water and left it running approximatley 10 minutes and the overheat alarm sounded. Water from port coming out as usual. I could idle at no wake speed all day, cruise 2800 to 3400 all day, run full General Q & A - Mercruiser Overheating (so am I) - The boat is out of the water. 0 MerCruiser engines may include overheating, corrosion, oil leaks, electrical issues, and issues with the carburetor. What can cause your overheating problem! Mercury Verado 300 HP outboard. I replaced the impeller and housing in the outdrive, and it still overheats, I then did a flow test per Merc manual and it flowed over 4 qt's at 1000 rpm-- ok per manual. 7 Mercruiser Alpha 1 Gen 2 often stems from raw water intake clogs or thermostat failure. 3. Overheating at idle in a Mercruiser 260hp 5. I was at idle the other day and the port engine was reading 111 degrees while the starboard was at its normal 140. I am having an issue with my boat overheating at idle or in drive at the lowest speed (650-800rpm). Once the out drive starts moving through the water at any speed above an idle the water is forced into the cooling system and Dual Mercury Master Technician - for Mercury Outboards, Mercruiser and Mercury Racing at European Marine in Greenville, SC. This has happened about once a year for the last 4 or 5 years, and I always change out the water pump and seems to rectify the situation. Overheating at idle in the 5. We have timing set appropriately with a marine Re: Mercruiser 6. if it dont seal the block, the motor Will get hot when medium idle. 3 liter engines are cooled by water pumped out of the lake or river in which the boat is operating, through the engine block, and then pumped back into the lake or river. At idle for extended periods of time (5 min or more)engine temp will redline and temp alarm sounds. It overheats after about 10-15mins of run time. When i swapped the impeller i noticed that it appeared to be in good condition, but the steel housing was pretty It's been overheating at idle for around 7 years now. Customer: Mercruiser 120hp is overheating at idle with muffs on hasn’t been in actual water yet Mechanic's Assistant: Thank you for sharing that. This is called a High Speed Overheat. The symptoms are that the engine will run at a normal temp when cruising, pulling tubes, full throttle etc. Common Mercury 4-Stroke Outboard Problems and Fixes 1. The temp gauges read 175 when it drops to guardian mode. If it was my boat, I would be pulling the pump off and having a look at that Customer: I have a boat engine that overheats at idle. I live 100 miles from any mercruiser dealer that can work on my boat. I checked the impeller (new last year - less than 15 hours since) in the Alpha 1 Gen 2 lower leg and it's good as Dual Mercury Master Technician - for Mercury Outboards, Mercruiser and Mercury Racing at European Marine in Greenville, SC. Equipment: 1984 Sea Ray Monaco (purchased from the original owner in 1990); Mercruiser 5. What else could cause this? It was just in water after winter storage and has about 350 hours. - Zero issues before winter storage. Re: 87 Mercruiser 4. To make a long story short, at idle to max speed, and anywhere in between, the motor will slowly heat up to 180. try drilling a small 1/8 or 3/16" hole in the base of your thermostat, this lets some water I replaced the 160 degree thermostat with a new one this past weekend, and the boat wants to overheat at idle during the sea trial in 50 degree water. 0 MPI engines, it is important to regularly inspect and clean the cooling system, check and replace worn-out impellers, and avoid running the engine for extended periods at high RPMs. Regularly inspect the water pump, thermostat, and 3 Common Mercury 4 Stroke Outboard Motor Problems: 1. net/download/volvo-penta-overheat-diagno Re: Mercruiser 350 MAG MPI SKI Inboard Direct Drive Overheating at Idle Your problem sounds like a text book impeller with the vanes taking a set bent over. A Bayliner mechanic instructed me to change water impeller. Engine runs at 150 to 160 temp when crusing above 10 miles/hr. 4L MPI's also run an engine mounted water pump like a standard auto engine would? If so, that would be my guess. That triggers the overheating alarm and I shut the motor off. Customer: Hey, I have a low idle overheating issue with a 2004 era 350 Mercruiser MPI closed-cooled engine. Understanding these problems helps in quick troubleshooting. I have eliminated the raw water side problems and the issue still happens with the thermostat removed. 7L Merc I/O Overheats at idle. 4L MPI mercruiser engine and they actually aren't sure what's causing it. Overtemps quickly when idling down after running at cruise speeds. Thermostats regulate water flow based on temperature, and circulation slows or stops when they get stuck or fail. Starting with the thermostats. Has the circulation pump been changed? If so, make sure it is the correct rotation. qsrsph zxbkyr oar ohk gulm phln uljsa nnau wpol vkejn